Method of producing acid- and fireproof bodies.



ISRAEL SCHLOSSBERG, OF HAMBURG, GERMANY. I

METHOD OF BRODUCING ACID- AND FIREPROOF BOJ JIES.

No Drawing.

To all whom it may ooncrn: I

Be it known that I, IsizAEL SCHLOSSBERG, Ph. D., a subject of theEmperor of Russia, residing at Hamburg, in theEmpire of Germany, haveinvented a novel Method of Producing Acidand Fireproof Bodies, of

which the following is a specification.

My invention relates to the manufacture of acidand fireproof bodiesconsisting principally of pure silicic acid. More particularly themanufacture is intended for producing highly fireproof stones, such asare used for lining furnaces serving for carrying out metallurgicalprocesses.

The novel process is essentially characterized in that the stones to bemanufactured are given the necessary strength required for their lateremployment and the inner coherence of the several constituent partswithout any previous burning process, and in that the burning processtakes effect only during the practical use of the bodies.

As is well known the strength of all the fireproof stones at present atdisposal rap idly diminishes during their practical use. so that thestones in the furnacelining re quire for this reason a frequentexchange. In contradistinction to the fireproof stones hitherto used.the fireproof stones manufactured according to my method will prove tobe better suited for their practical use,

since the temperatures acting upon the stones during their practical usecause the constituent parts to sinter, whereby the coherence isincreased.

As departing material for the manufacture of such fireproof stones thequartzite is' used. Suitablequantities of quartzite sand are mixed witha suflicient quantity of colloidal silicic acid under the addition of acorresponding quantity of lime in the manner, that the quartzite isintimately mixed .with the required quantities of colloidal silicic acidand calcium oxid or hydroxid and from the mixture so obtained, whichvery rapidly obtains a suflicient coherence, stones are formed, which ina known manner are hardened by means of steam. In

- order to remove the percentage of lime, the

stones are treated with silicofluoric acid, so that the lime combineswith the acid to form silicofiuorid of lime, which is soluble in water.and can be separated by lixivia- Specification of Letters Patent.

Patented Jan. 26, 1915.

Application filed July 15, 1913. Serial No. 779,096.

tion; The fact, that the stones during this lixiviation become porous isan advantage of the 'method. Under circumstances. instead of thesilicofluoric also other acids, such as for example hydrochloric acid,may be used.

The fireproof stones obtained in the just described manner will verywell withstand temperatures of 1800 centigrade and more and will befound to be'useful for all purposes, where similarly high temperatures.

are employed. In case, however,stones are to be produced, which are usedfor temperatures of only from 800 to 1200 centigrade,

the said method will require to be modified in some points. For I havemade the strange discovery, that the stones produced for the employmentat temperatures of 1800 centigrade and more do not sufficientlywithstand lower temperatures of from 800 to 1200 centigrade, but insomecases become friable. The reason for this lies in that a temperature of800 to 1200 centigrade does not sufiice for causing the stones obtainedby the above described method to sinter, so that during use they do notattain the sufiicient strength.

Detailed experiments have shown that for stones intended to withstandlow temperatures a certain quantity of a flux is required, which iscapable of causing the constituent parts to sinter already attemperatures'of 800 to 1200 centigrade, so that they attain a coherencesufiicient for these temperatures and a suflicient strength. Suchsintering means may be any substances which liquefy at the correspondingtemperatures, for example and with a great advantage ground glass orground bricks. In this case the method is carried on as follows: Thequartzite is intimately mixed with the required quantities of colloidalsilicic acid and calcium oxid or hydroxid and at the same time the'necessary quantity of ground glass or ground bricks is added.

From the mixture so obtained stones are formed as described above.Otherwise the method is exactly the same as before.

Example 1.

v. For less fireproof stones.7 parts of quartzite, 1 part ofgroundglass, 1 part of lime.

Example 2,

ducing acid and fireproof bodies, Which consists in Working quartzitewith colloidal silicic acid and lime so as to form a plastic mass,forming stones from this plastic mass, hardening these stones, freeingthe stones from lime by treating them with an acid capable of forming asoluble salt of calcium and by lixiviating the stones.

2. The herein described method of producing acidand fireproof bodies,which con- 'sists in Working quartzite with colloidal silicic acid andlime under the addition of a flux so as to form a plastic mass, formingstones from this plastic mass, hardening these stones, and freeing thestones from lime by treating them with an acid capable of forming asoluble salt of calcium and by lixiviating the stones.

3. The herein described method of producing acidand fireproof bodies,which consists in working quartzite with colloidal silicic acid and limeunder the addition of ground glass so as to form a plastic mass, formingstones from this plastic mass, hardening these stones, and freeing thestones from lime by treating them With an acid capable of forming asoluble salt of calcium and by lixiviating the stones.

4. The herein described method of producing acidand fireproof bodies,which consilicic acid and lime under the addition of ground glass andground bricks so as to form a plastic mass, forming stones from thisplastic mass, hardening these stones,

and freeing the stones from limebv treating them with an acid capable offorming a soluble salt of calcium and by lixiviating the stones.

' ISRAEL SCHLOSSBERG.

Witnesses:

ERNEST H. L. MUMMENHQFF, ANDREW W. PENTLAND.

